Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification
OwnerDaniel R. Higgins, Eugene Sullivaninventors
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Abstract
A ground supported single drum power boiler is described combining a refractory lined and insulated V-Cell floor; refractory lined and insulated combustion chamber; integrated fuel chutes configured to pre-dry wet solid fuel; top mounted fuel bin; internal chamber walls; configurable combustion air systems; and a back pass with after-burner ports and cross flow superheaters. The boiler can be configured in pre-assembled modules to minimize the field construction time and cost. An alternative embodiment is adaptable as a gasifier.
Claims20
The floor of a solid fuel fired boiler is configured as one or more troughs in which most of the fuel firing said boiler falls into said trough or troughs and burns therein, each of said trough or troughs comprising an outer supporting structure, an inner refractory layer, and an insulating layer between said outer supporting structure and said inner refractory lining, and wherein a fuel level corresponds to the upper surface of said fuel.
A solid fuel fired boiler with one or more walls internal to the furnace section of the boiler, each of said walls being comprised of closely spaced steel tubes in mutually parallel relationship and aligned such that the axes of the tubes are vertical for the majority of their length, with said tubes comprising one or more water and/or steam circulation circuits within the boiler.
A solid fuel fired boiler with a fuel bin located on top and a multiplicity of fuel chutes configured to conduct fuel to a furnace of said boiler, wherein the majority of the floor area of said fuel bin comprises conveying screws configured to feed fuel at a controlled rate from said fuel bin to each of said multiplicity of fuel chutes, wherein each of said conveying screws is configured to convey fuel at an independently-controllable rate to the furnace of said boiler.
20-29. (canceled)
Dependencies are inferred from the claim text.